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millner(at)me.com
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 Posted: Thu Dec 15, 2011 3:00 pm Post subject: Use of non-aviation Ford-style regulators |
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Note that it can be dangerous to use non-aviation Ford-type regulators in our airplanes. When the alternator half of the master switch is turned off, the regulator will allow the alternator to go into a voltage runaway mode, and that overvoltage will not be controlled by your overvoltage relay (since the field current is flowing via a separate path, directly from the alternator). The overvoltage condition can cook your avionics and battery.
Even if you don't turn off the alternator half of the master switch, if your separate overvoltage relay trip for any reason with such a regulator installed, that, ironically, will trigger the voltage runaway scenario.
Paul
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ainut(at)knology.net
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| Posted: Thu Dec 15, 2011 5:18 pm Post subject: Use of non-aviation Ford-style regulators |
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Uh oh. What's the protection for this? I'm using not a Ford, but a
smaller, denser, lighter Japanese alternator with same output.
David Merchant
Paul Millner wrote:
| Quote: |
Note that it can be dangerous to use non-aviation Ford-type regulators
in our airplanes. When the alternator half of the master switch is
turned off, the regulator will allow the alternator to go into a
voltage runaway mode, and that overvoltage will not be controlled by
your overvoltage relay (since the field current is flowing via a
separate path, directly from the alternator). The overvoltage
condition can cook your avionics and battery.
Even if you don't turn off the alternator half of the master switch,
if your separate overvoltage relay trip for any reason with such a
regulator installed, that, ironically, will trigger the voltage
runaway scenario.
Paul
|
--
Tell the truth. Be honest. Be responsible to and for yourself.
I liked America when it was free and it's people were responsible and had morals.
Every gram of cocaine you buy from elsewhere contributes to an innocent being murdered in Central and South America. Grow your own or Stop taking it.
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